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Welcome to AX84® the base camp for tube (valve) electronics hobbyists.

AX84 exists to provide:

1) A great environment to learn about music-related electronics in general. AX84 is a place where those with experience are interested in helping diligent beginners who are willing to do their homework.

2) A place where those with more experience can field their ideas to peers and get useful feedback.

3) An environment that respects the past, but is not enslaved by it. INNOVATION IS GOOD (and it didn't die in the 1950s.) There are new things under the sun every day. Move the ball forward!

Our HUGE discussion area is under 'Discussion Forum' to your left.

We are hard at work improving the site- check back often!

Recent Forum Threads
"Preamp Design Review & switching option help"
Posted By tristanc on 02/10/2016
I've continued modifying my L2L-style build following learnings from LTSPICE modelling / posts to this forum / prototyping / lots of Googling etc.

Here is a portion of the schematic focussing on th...

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"My new book (Hi-fi preamps) is now available!"
Posted By Merlin on 02/09/2016
It may interest some of you to now that that I have written a new book: Designing High-Fidelity Valve Preamps

OK, OK, stop going on about it, I know you wanted ...

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"Master volume too sensitive"
Posted By speedgeezerbutler on 02/09/2016
Some time ago, I found a tube organ for free on Craigslist. I scavenged the tubes and 50w 6l6 power amp from the organ. Then, I built the pre amp portion of the Hi-octane. I mounted the whole mess int...

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"Strange intermittent scratchy/poppy noise"
Posted By Lord of the Livingroom on 02/08/2016
Hi all! Question for the guru’s. My google and youtube searches didn’t find anything comparable.

I have an odd intermittent noise coming from my JTM45 clone build (with pre-PI master volume) hous...

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"Too Big To Fail?"
Posted By Douche Baggins on 02/08/2016
Anyone notice for the past five years or more that remodelled homes look very similar inside. Most look like HD or Blowes big box store updated the kitchen, bathrooms and whole house flooring. My theo...

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Updates: Wed, Feb 10th, 2016 @ 17:22:31
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Site News

2014-10-21: Be sure to check out our discussion forum using the link on the left..

2014-10-20: The Treasure Fleet is on the way to Rio De La Hacha with a fortune in gold!

We're looking for media clips of recent builds... please stop by the forum and respond to the thread.

2008-10-4: Archived Projects section is functional again.

2008-9-18: RSS Feeds for the forum have been up for a while, but not advertised...
* Active Threads
* New Threads
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2008-6-26: Want to participate in our discussion forums? You are welcome to read and lurk as you like. If you think you'd like to post with regularity, please sign up for an account.

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